Structural beam



FIG. 1 is an end elevation of the structural beam of this invention;

FIG. 2 is a side elevation of the structural beam of FIG. 1;

FIG. 3 is a top plan view of the structural beam of FIG. 1; and

FIG. 4 is a perspective view of the structural beam of FIG. 1.

The ornamental design for a structural beam, as shown and described.